Originally Posted by spirosentra

A lot of QR25 guys (SE-R and Spec-V) will try to tell you not to waste your time. They'll tell you just to trade your QG18 in for a QR25 powered car. I may be biased, since I own a QG18 myself, but I say they're wrong. Import tuning is all about doing what you can with what you have, and you have a QG18.

If you want to do regular bolt on mods like an aftermarket intake, header, exhaust, and crank pulley, all of those parts are available for the QG right now. Hopefully soon, we'll have more aggressive cams available too (don't hold your breath... it's gonna be a little while).

As far as your suspension goes, you've got plenty of options. There are a growing number of parts specifically for the QG18 Sentra models, but you can often use parts meant for the "sportier" Sentra models powered by the QR25. Suspension parts for the SE-R/Spec-V won't always bolt up directly to your car, but usually it only requires a little bit of modification; for example, if you want to use Spec-V dampers, you need to get Spec-V upper mounts to go with them, but then it's a fairly easy install.

Earlier, you mentioned damaging your engine with a turbo or nitrous oxide. It is VERY possible to damage ANY engine with a turbo or nitrous setup if you don't build and tune the setup properly. If you're willing to spend the time and money to tune your car properly, then you can enjoy forced induction (and crazy-stupid speed) safely.